CBSE Questions for Class 11 Medical Biology Biological Classification Quiz 7 - MCQExams.com

Which of the following helps in respiration of lichens?
  • Isidia
  • Soredia
  • Cyphella
  • Cephalodia
Identify the organism.
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  • Bread mould
  • Rhizopus
  • Both
  • None
Which are sensitive to sulphur dioxide pollution?
  • Algae
  • Mosses
  • Lichens
  • Ferns
Structure used for locomotion in Euglena is:
  • Aplanospores
  • Flagella
  • Pseudopodia
  • All of the above
What are prions ?
  • They are not pathogens
  • They are animal friendly
  • They are pathogens with no nucleic acid
  • None of the above
Who discovered virus?
  • Stanley
  • Ivanowski
  • Herelle
  • Beijerinck
Which group includes moulds and yeast?
  • Rhodophytes
  • Bryophytes
  • Fungi
  • Ciliates
  • Flagellates
A virus is also known as parasite because it
  • Harms its host
  • Cannot reproduce outside its host
  • Kills its host
  • Both A and B
  • All of the above
Nucleic acid is absent in __________.
  • Virus
  • Viroid
  • Prion
  • Mycoplasma
In most fungi, cell wall is chiefly made up of
  • Cellulose
  • Chitin
  • Protein
  • Lipid
The oospore divides into two cells. The upper cell enlarges. It is called
  • Suspensor
  • Cotyledon
  • Embryonal
  • Protonema
The conditions for a virus to attack a host cell is
  • The virus must have the DNA or RNA key sequence to enter the host cell.
  • The virus must have the enzymes to cause the host cell to burst so that the host cell may be used as raw materials.
  • The virus must have the proper enzyme to puncture the membrane of the host cell.
  • The virus must have a particular shape that will match up with the proteins on the surface of the host cell.
  • The viral DNA or RNA must have sequence that is recognised by the ribosomes of the host cell.

Paramecia are members of the Kingdom
  • Fungi
  • Animalia
  • Archaea
  • Protista
  • Plantae
Lichens are sensitive to
  • $$S{O}_{2}$$ pollution.
  • Sewage pollution.
  • Noise pollution.
  • Radioactive pollution.
Which of the following statements is true for viruses?
  • Viruses multiply only in living host
  • Their crystals have a definte shape
  • Viruses grow and multiply by themselves outside the host
  • Viruses cannot be crystallized
Bacteriophage viruses were added to a petri dish containing sterile agar growth medium. After a week, the dish was sampled and a number of viruses present was compared. What results would be expected?
  • The virus populations should be in exponential growth since there are ample food and no competition.
  • After a week, the viruses should be reaching carrying capacity and the population will be stabilizing.
  • After a week, the viruses should have already exhausted most of the resources in the closed petri dish and the population will be on the decline.
  • No new viruses will be present without the presence of host bacteria.
What type of association is shown by lichens (an alga and fungus), in which the fungal component absorbs water and nutrients for both organisms, while the algal component manufacturers food for both organisms through photosynthesis?
  • Parasitism
  • Commensalism
  • Predation
  • Mutualism
  • Interspecific competition
Select the correct pair in which one photosynthesizes, whereas the other does not.
  • Cyanobacteria and algae
  • Algae and fungi
  • Mosses and ferns
  • Ferns and gymnosperms
  • Gymnosperms and angiosperms
An organism is larger than bacteria and primarily composed of protein. It is covered with a lipid-based membrane. This organism consists genetic material as double-stranded DNA and lacks RNA.The interior of the structure have few enzymes. Identify this organism.
  • A virus
  • A protozoan
  • An alga
  • A bacterium
  • A prion
Why are viruses considered to be non-living?
  • They do not have cells.
  • They cannot reproduce on their own.
  • They have no metabolic activity.
  • All of the above.
Which of the following exhibit the characteristics given below?
i.Plant like organisms
ii.Lacks chlorophyll
iii.Mostly saprophytes and parasites
  • Euglena
  • Fungi
  • Algae
  • Bryophytes
Which of the following bacteria is observed as chain-like formation?
  • Escherichia coli
  • Bacillus subtilis
  • Streptococcus phosphatase
  • Micrococcus flavus
Mosaic disease was first reported by 
  • Adolf Mayer
  • Robley Williams
  • Louis Pasteur
  • None of the above
Mycobiont and phycobiont association is
  • Symbiotic
  • Commensel
  • Parasitic
  • Helotism
Read the following statements regarding archaebacteria.
I. Their cell wall lacks peptidoglycan.
II. They contain membrane bound organelles.
III. These have distinct ribosomal RNA sequence.
IV. Lipid in cell membrane of archaebacteria have different structure than those in all other organisms.
Choose the incorrect option.
  • I and II
  • Only II
  • Only IV
  • III and IV
When there are two haploid nuclei per cell in some fungi before the forming the diploid structure, this stage is called
  • Diplotene
  • Diplophase
  • Haplophase
  • Dikaryon
 Dmitry Ivanovsky reported the existence of virus in
  • Tobacco
  • Potato
  • Wheat
  • None of the above
Which one does not belong to monera?
  • Slime moulds
  • Mycoplasma
  • Eubacteria
  • Archaebacteria
Archaea inhabits in
  • Soil
  • Hydrothermal vents
  • Human gut
  • Wetland
Tobacco mosaic virus was first reported by
  • Watson and Crick
  • Ivanoski
  • Robert Brown
  • Both A and B
In Mucor, conjugation results in :
  • Zoospore
  • Akinete
  • Arthrospore
  • Zygospore
Mosquitoes were carrying the cause of yellow fever. The statement was concluded by
  • Carlos Finlay
  • Louis Pasteur
  • Martinus Beijerinck
  • None of the above
Virion containing only a single copy of nucleic acid is called as
  • Diploid virus
  • Variola virus
  • Haploid virus
  • Retro virus
The term 'genetic RNA' refers to
  • Genetic material of RNA viruses
  • The RNA that carries genetic message
  • The RNA that helps gene regulation in lac-operon
  • The RNA present in mitochondria
The scientist who first gave the dynamic concept of species 
  • Julian Huxley
  • Linnaeus
  • Lamarck
  • John Ray
A pathogen which cannot be cultured in an artificial medium is
  • Protozoan
  • Virus
  • Bacterium
  • Fungus
Which of the following is also called as 'root ripe'?
  • Umbiicaria esculenta
  • Cetaria islandica
  • Cladonia rangiferina
  • Rocella
LPP-1 is a
  • Bacterium
  • Fungus
  • Bacteriophage
  • Cyanophage
Typological concept of species was given by
  • Mendel
  • Aristole and Plato
  • John Ray
  • Hutchinson
Who has written the book 'Genera Plantarum'?
  • Hutchinson
  • Engler and Prantal
  • Eichler
  •  Carolus Linnaeus
Protein infectious particles better known as 'Prions' are also called as 
  • Incomplete virus
  • Slow virus
  • Gemini viruses
  • Satellite virus
The cell theory is not applicable to
  • Algae
  • Fungi
  • Viruses
  • Lichens
Smallest virus is
  • Foot and Mouth virus
  • Alfalfa Mosaic virus
  • Pseudomonas $$Pf$$
  • $$TMV$$
Who discovered virus to be nucleoprotein entity?
  • Clausis
  • Pasteur
  • Ivanowski
  • Bawden and Pirie
Scala Naturae was written by
  • Hippocrates
  • Thales
  • Aristotle
  • Theophrastus
The gametes in Rhizopus develop in specially formed cells known as
  • Suspensor cell
  • Progametangia
  • Gametagia
  • Antheridia
Number of plants described by Linnaeus is
  • 15000
  • 13291
  • 5900
  • 2781
According to Susruta Samhita, Virudha consisted of
  • Flowering plants.
  • Shrubs.
  • Osadhi.
  • Jangama.
Name the virus which was crystallised for the first time.
  • Parrot fever virus
  • Small pox virus
  • TMV
  • HIV
Great chain of being is
  • Biblian concept of origin of life.
  • Hierarchical arrangement of organisms by Aristotle.
  • Hierarchical arrangement of animals by Theophrastus.
  • Origin of Life by Thales.
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